Air-Bloc 31MR, Air-Bloc 32MR and Air-Bloc 33MR fluid-applied air and water barrier membranes incorporate a universally dispersed biocidal agent throughout the cured membrane, which helps to resist mold, mildew and fungus on the membrane's surface. The membranes' antimicrobial technology works by inhibiting enzyme reactions that mold cells use to produce energy for growth and reproduction.